com.datastax.driver.dse.graph.GraphSON2DriverTimeModule Maven / Gradle / Ivy

Go to download
/*
 * Copyright DataStax, Inc.
 *
 * This software can be used solely with DataStax Enterprise. Please consult the license at
 * http://www.datastax.com/terms/datastax-dse-driver-license-terms
 */
package com.datastax.driver.dse.graph;

import com.datastax.driver.core.LocalDate;
import com.datastax.driver.core.ParseUtils;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.ser.std.StdScalarSerializer;
import com.google.common.collect.ImmutableMap;
import java.io.IOException;
import java.text.ParseException;
import java.util.Date;
import java.util.Map;

class GraphSON2DriverTimeModule extends GraphSON2JacksonModule {

  GraphSON2DriverTimeModule() {
    super("graph-graphson2drivertime");

    addSerializer(LocalDate.class, new JavaDriverLocalDateSerializer());

    addDeserializer(LocalDate.class, new JavaDriverLocalDateDeserializer());
  }

  @Override
  public Map, String> getTypeDefinitions() {
    final ImmutableMap.Builder, String> builder = ImmutableMap.builder();
    builder.put(Date.class, "Instant");
    return builder.build();
  }

  @Override
  public String getTypeNamespace() {
    return "gx";
  }

  static final class JavaDriverLocalDateDeserializer extends StdDeserializer {

    JavaDriverLocalDateDeserializer() {
      super(LocalDate.class);
    }

    @Override
    public LocalDate deserialize(JsonParser p, DeserializationContext ctxt)
        throws IOException, JsonProcessingException {
      String dateString = p.getText();
      try {
        Date date = ParseUtils.parseDate(dateString);
        return LocalDate.fromMillisSinceEpoch(date.getTime());
      } catch (ParseException e) {
        throw new IOException("Could not deserialize data as a LocalDate.", e);
      }
    }
  }

  static final class JavaDriverLocalDateSerializer extends StdScalarSerializer {

    JavaDriverLocalDateSerializer() {
      super(LocalDate.class);
    }

    @Override
    public void serialize(LocalDate value, JsonGenerator gen, SerializerProvider provider)
        throws IOException {
      gen.writeString(value.toString());
    }
  }
}